Single control carrying scraper



July 27, 1937. s. s. MOORE SINGLE CONTROL CARRYING SCRAPER Original Filed Jan. 30, 1935 3 Sheets-Sheet l INVENTOR S. S.M0

BY Q ATTORNEY July 27, 1937.

s. s. MOORE Efi$fl91 SINGLE CONTROL CARRYING SCRAPER Original Filed'Jan. 50, 19:55 3 Sheets-Sheet 2 JuhI27 1937.

S. S. MOORE SINGLE CONTROL CARRYING SCHAPER Original Filed Jan. 50. 1935 INVENTOR Z08&091

s Sheet-Sheet 3 Patented July 27, 1937 UNITED STATES PATENT OFFICE Application January 30, 1935, Serial No.

Renewed April 8, 1937 18 Claims. (Cl. 37-126) This invention relates to scrapers and particularly to carrying wheeled scrapers of what may be considered the medium size or general utility typelarger than the small Fresno or similar.

tractor for their operation. The bowl of my scraper is movably suspended 10 in a wheel supported frame for separate vertical movements both at its forward scraping edge and at its rear end; and one of the objects of my invention is to so mount the bowl that by the use of a single pull cable, the bowl may be suc- 15 cessively moved from a scraping to a carrying position clear of the ground, and then tipped forwardly to discharge the load-all with a continuous movement of the cable in the same direction. The bowl is also arranged so that when 20 the pull on the cable is released it drops of its own weight to a scraping position.

I also employ a front end gate or apron to co- 25 further object of my invention is to so mount this apron in connection with the bowl that as the latter is raised from a scraping to a carrying. position by means of the single cable previously mentioned, the apron will automatically approach 30 and engage the front of the bowl; while with a further upward movement of thebowl to a dump-' ing position the apron will be both raised and at the same time retracted from the bowl.

The single cable operated from the tractor be- ;5 ing all that is necessary to manipulate the bowl and cause the same and the apron to assume any desired position, as above outlined, the mechanism of the scraper is very simple and conseuuently its cost of construction is relatively low.

The operation of the scraper is also greatly simpllfled since there is only the one cable drum to and the use of reversely driven cables which frequently tangle, or heavy return springs which increase the resistance and power necessary for operation, are eliminated.

A still further object is to so mount the bowl that it always tends to dig into the ground of itself without the use of any pushanisms; the digging depth being controlled and maintained merely by holding the cable against slackening when reached.

These objects I accomplish by means of such structure and relative arrangement of parts as the desired depth has been will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views:

Figure 1 is a side elevation of my improved scraper in its scraping position.

Figure 2 is a similar view partly in section showing the scraper in a carrying position.

Figure 3 is a side elevation showing the scraper in its dumping position.

Figure 4 is a fragmentary transverse section of the scraper taken on the line 4-4 of Figure 2.

Figure 5 is a fragmentary view showing a modifled adjustable support for the apron pivot.

4 projecting forwardly therefrom and by means of which conarms are rigidly apron l6 adapted to cooperate to form a o the .fcr the front lower portion of the bowl when said bowl and apron are in a certain position relative to each other as will be hereinafter set forth. The arms l5 rearwardly of the pivots M are provided with rigid upstanding extensions 11, the upper ends of which are pivotally and adjustably connected to the pins i2 by links IS. The links are here shown as being L-shaped,

with the angular portion inverted and at the links, in order to clear the they straddle in all posi forward ends of the extensions H which tions.

The bowl is connected to the arms I5 by links l9 extending from pivots 20 on the bowl near the front lower edge of the same, to pivots 2| on said arms adjacent the base of the extensions 11. Extending from front to back of the frame and arching over the bowl is a centrally disposed hollow truss beam 22 preferably comprising a pair of channels placed in facing relation, as shown in Figure 4. the main frame just back of the front wheels by diagonals 23 and by other diagonals 24 depending to the cross beam 1 which extends between the rear wheels.

A sheave block 25 is mounted in the beam 22 above the back of the bowl, and a similar block 26 is fixed on the back of the bowl centrally thereof and a short distance above the line of the pivots l2. A cable 21 extends from the.

tractor into the beam 22 adjacent its forward lower end and passes up to and about the sheave 25 over direction changing pulleys 28 enclosed in said beam. A very neat operating structure is thus provided. The cable depends clear of the beam at the sheave 25 and then passes about the sheave 26, being anchored on one of said sheaves. A pull on the cable therefore raises the bowl at its rear end.

When the bowl is in its digging position, as shown in Figure l, th arms II have a downward slope toward their forward end, the links I9 are substantially vertical in depending relation to the arms i5, while the links it have a somewhat steep upward and forward slope. The pivots i2 are then below the line L drawn through the pivots 20 of the links H and the pivotal shafts ill of the arms ll. As a result of this arrangement the scraper blade when once engaged with the ground has no tendency to lift out of the ground, but on the contrary will always dig in as deep as the slack on the cable will permit.

With all movements of the scraper from digging to dumping positions the pivotal point l2 of the arms H moves upwardly about an are A centered at the axles I0; this are first curving forwardly and then rearwardly, as shown in Figure 2. This feature is of importance in operating the scraper as will appear.

As the cable is pulled upwardly swinging the arms and bowl upwardly at its rear end, the links l8 which are connected to the pivots l2 are shifted toward a horizontal position. The forward end of the links l8 thus becomes shifted forwardly which causes the extensions ll of the arms l5 to be also swung forwardly, the rear end of said armsraised and their forward ends lowered, said arms of course turning on the pivots H. As a result the links l9 are raised, lifting the front end of the bowl while at the same time the apron is lowered toward the bowl. After a predetermined amount of such movement, the apron engages closing the same while the pivot points lo, l2, and the pivotal connections 0 of the links is This beam is braced from the front of the bowl with the extensions l1 lie in a common or dead center alinement, as shown in Figure 2. The arms H and the links l8 have then reached their limit for forward movement.

With a further upward pull on the cable the pivots l2 swing upwardly but rearwardly, pulling the links it rearwardly also, which again raises the apron to adjacent its original position. At the same time the links l9, while being relatively lowered, are swung rearwardly due to the rearward movement of the bowl as a whole so that the front end of the bowl becomes raised but to a considerably lesser extent than its rear end. The bowl thus finally assumes the position in Figure 3, in which the bottom of the bowl is set at a steep slope so as to facilitate easy discharge; the front scraping edge is shifted a considerable distance rearwardly of its previous or normal position and is well above the ground so that ample discharge space between the apron and the front of the bowl and between the scraping edge and the ground is had.

The arms I I are then disposedat a sharp upward angle, the links l8 (on a direct line between their end pivots) having a downward the front while the links ID are substantially horizontal and face toward the rear. Upon releasing the pull on the cable the bowl drops of its own weight. at the same time of course restoring the various arms and links to their original positions due to the connection of the same with the bowl. As the scraping edge of the bowl engages the ground it will again dig in of itself to the depth permitted by the cable, as previously explained.

The central arch or truss beam which supports the cable sheave is sufllciently high to permit all necessary lifting of the bowl, while the diagonal braces 24 between said beam and the cross beam 1 of the main frame, transmit the strains had with the lifting of the bowl from said beam 22 to the main frame adjacent the wheels. Any tendency to bend the main frame with the lifting strains is thus eliminated and said frame may be made relatively light.

If it is desired to alter the normal slope of the bottom of the scraper, so that the bowl will enter the ground at different angles as the type of ground negotiated may require, it is only necessary to alter the point of connection of the links it with the pivots l2. This of course slope toward has the effect of swinging the arms II, raising or lowering the links I! and consequently the front end of the bowl correspondingly. At the same time the movement of the bowl to the different positions as previously described is not interfered with.

The same result may be the pivots H of the arms i5 for vertical adjustment, as shown in Figure 5. In this case the pivots Ila are mounted in blocks 29 which are slidable in vertical yokes 30 secured to the side beams in. Adjustable screws 3| in the yokes hold the blocks in any set position.

If desired the apron may be mounted on its supporting arms in a manner to prevent possible breaking or distortion of any part in the event that rocks and the like are caught between the apron and the front of the bowl so as to prevent the proper closing of the apron. Such mounting of the apron is shown in Figure 6. In this case the sides of the apron I ia are shifted adjacent their rear end on the arms I511, as shown at R. Compression closing housings 33 are obtained by mounting disposed between the front ends of the arms and the sides of the apron balance. In this manner the lip of the apron can yield upwardly or away from the bowl after the arms are lowered, preventing possible distortion of the apron or its arms or damage to other Parts.

From the foregoing description it will be readily seen that Ihave produced such a device as substantially fulfills the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention, what I claim as new and useful and desire to secure by Letters Patent is:

1. A scraper, comprising a wheel supported frame, a bowl, arms pivoted on the frame behind the bowl and on the back of the bowl near the bottom, means applied to the back of the bowl to pull the same upwardly, means suspending the bowl from the frame near the front of the bowl, and means acting on the suspending means with the upward movement of the back of the bowl to also lift the front end of the bowl.

2. A scraper comprising a wheel supported frame, a bowl, arms pivoted on the frame behind the bowl and on the back of the bowl near the bottom, means applied to the back of the bowl to pull the same upwardly, means suspending the bowl from the framenear the front of the bowl, and linkage means between the suspending means and the backof the bowl arranged to pull up on the suspending meansas the back of the bowl is lifted.

3. A scraper comprising a wheel supported frame, a bowl, arms pivoted on the frame behind the bowl and on the back of the bowl near the bottozmmeans applied to the back of the bowl to pull the same upwardly, rearwardly projecting arms pivoted on the frame adjacent the front of the bowl, depending links pivoted on the rear end of the arms and on the bowl, and means between the arms and the back of the bowl to swing the arms upwardly as the back of the bowl is lifted. r

4. A scraper comprising a wheel supported frame, a bowl, arms pivoted on the frame behind the bowl and on the back of the bowl near the bottom, means applied to the back of the bowl to pull the same upwardly, rearwardly projecting arms pivoted on the frame adjacent the front of the bowl, depending links pivoted on the rear end of the arms and on the bowl, rigid extensions projecting upwardly from the arms, and links pivoted on the upper ends of the extensions and projecting rearwardly and pivotally connected to the bowl at the back thereof.

5. A scraper comprising a wheel supported frame, a bowl, arms pivoted on the frame behind the bowl and on the back of the bowl "near the bottom, means applied to the bowl to pull the same upwardly, and means supporting the bowl near its front end and including depending links pivoted on the bowl adjacent its forward end; a straight line drawn through the pivotal connection of each link with the bowl and the pivotal connection of the corresponding arm with the frame lying above the pivotal connection of said arm with the how] when the scraping edge of the bowl is in contactwith the ground.

6. A scraper comprising a frame which includes side beams, spaced wheels inwardly of said beams adjacent the rear end thereof, hearing members for each wheel on both sides thereof, a bowl hung between the beams, ahead of the wheels, a central truss beam extending from end to end of the frame and arching over the bowl, lifting means between the back of the bowl and said truss beam above the back of the bowl, and transversely diagonal brace members extending from the truss beam to connections with the frame adjacent the inner wheel bearing members.

'7. A scraper including a wheel supported frame, a bowl hung therein, means applied to the bowl to lift the same from a scraping position to a carrying position and thence to a dumping position, an apronto cooperate with the front of the bowl mounted on the frame, and means connecting the apron with the bowl so that when the bowl is in scraping position the apron will be clear of the bowl; when the bowl is raised to a carrying position the apron will be lowered to engage the bowl, and when said bowl is further raised to a dumping position the'apron will be again raised to clear the bowl. a

8. A scraper comprising a wheel supported frame, a bowl, means hanging the bowl in the frame so that with an upward pull on the back of the bowl the scraping edge of said bowl will first be raised from the ground a certain distance without appreciable longitudinal movement and will then move rearwardly and upwardly but i20 a lesser extent than the movement of the back of the bowl, an apron mounted on the frame to cooperate with the bowl when the scraping edge of the latter is in said certain position, and means connecting the apron with the bowl so that when the bowl is in a. scraping position the apron will be held above and ahead of the scraping edge of the bowl; when said edge is in said certain t" position the apron will be lowered to cooperate therewith, and when said-bowl is furtherraised, the apron will be raised and held clear of the bowl.

front of the bowl, an apron to cooperate with the front of the bowl supported by the last named arms in front of their pivot, links depending from and pivoted on the apron supporting arms rearwardly of the pivot thereof and on the bowl below, extensions rigid with and upstanding from said apron supporting arms, and links pivoted on said extensions and on the bowl in common with said first named arms and disposed with an upward slope to the front when the bowl is in a scraping position; whereby with the initial upward movement of the back of the bowl and said first named arms the last named links will shift toward a horizontal position and will impart a swinging movement to the apron supporting arms in a direction to both lower the apron, and lift the front end of the bowl; the pivotal points of said last named links at both ends and the pivotal connection of said first named arms with from the frame, means connecting front of the bowl has been lifted a certain amount and the apron has been lowered to cooperate therewith.

10. A scraper comprising a wheel supported frame, a bowl, arms pivoted on the frame behind the bowl and on the back of the bowl near the bottom, means applied to the back of the bowl to pull the same upwardly, said arms having a downward slope to the bowl when the latter is in a scraping position but swinging to assume an upwardly sloping position when the back of the bowl is swung upwardly to a dumping position, an apron to cooperate with the front of the bowl, means supporting the p n the bowl at the front and the aprgn supporting means so that as the apron is lowered the f ont end of the bowl will be raised, and means functioning with the swinging of the arms toward a horizontal position for thus lowering the apron to a bowl cooperating position; and also functioning with the swinging of said arms a predetermined amount beyond a horizontal position for then raising the apron clear of the bowl.

11. A scraper comprising a wheel supported frame, a bowl, means applied to the back of the bowl to pull the same upwardly, an apron to cooperate with the front of the bowl, means movably supporting the apron from the frame, means connecting the bowl adjacent the front and the apron supporting means so that as the apron is lowered by the movement of its supporting means the bowl will be lifted at the front, and means functioning with the upward movement of the back of the bowl a certain amount to thus move said apron supporting means, so that the apron cooperates with the bowl.

12. A scraper comprising a wheel supported frrrme, a bowl, means applied to the back of the bowl to pull the same upwardly, an apron to cooperate with the front of the bowl, means movably supporting the apron from the frame, means connecting the bowl adjacent the front and the apron supporting means so that as the apron is lowered by the movement of its supporting means the bowl will be lifted at the front, and means functioning with the upward movement of the back of the bowl a certain amount to thus move said apron supporting means, so that the apron cooperates with the bowl, and also functioning with an upward movement of the bowl more than said certain amount to move and raise the apron clear of the bowl.

13. In a scraper having a frame and a vertically movable bowl therein, arms pivoted on the frame and projecting forwardly of the bowl, means to lower the arms at their forward ends as the forward end of the bowl is raised, an apron pivoted at its rear end on the arms to cooperate with the bowl when the arms are thus lowered,

and spring means between the arms and apron yieldably resisting upward movement of the lower edge thereof.

14. In a scraper having a frame and a vertically movable bowl therein, arms pivoted on the frame and projecting forwardly of the bowl, means to lower the arms at their forward end as the bowl is raised from a predetermined position, an apron to cooperate with the bowl when the bowl is thus raised and the arm is lowered,

and means mounting the apron in connection with the arms so that the apron can yield'upwardly a predetermined amount without a corresponding movement of the arms while causing the apron to be raised as the arms are raised.

15. A scraper comprising: a traction-supported frame; a digging bowl; lifting means, applied to the back of the bowl; supporting means for the front of the bowl; and means, other than the bowl itself, operatively connecting the back of the bowl to the supporting means, whereby the lifting of the bowl at the back operates to raise the scraping edge of the bowl, but to a lesser extent than the back of the bowl, so as to finally dispose the bottom of the bowl at a steep angle to the ground for dumping,

16, A scraper comprising: a traction-supported frame; a digging bowl; lifting means, applied to the back of the bowl; supporting means for the front of the bowl; and a linkage operatively connecting the back of the bowl to the supporting means, whereby the lifting of the bowl at the back operates to raise the scraping edge of the bowl, but to a lesser extent than the back of the bowl, so as to finally dispose the bottom of the bowl at a steep angle to the ground for dumping.

17. A scraper comprising: a traction-supported frame; a digging bowl; lifting means, applied to the back of the bowl; supporting means for the front of the bowl; means, other than the bowl itself, operatively connecting the back of the bowl to the supporting means; and

means connecting the bowl to the frame whereby the resistance of the ground, during the forward movement of the frame causes a tendency, resisted and controlled by the lifting means, for the scraping edge of the bowl to descend.

18. A scraper comprising: a traction-supported frame; a digging bowl; lifting means, applied to the back of the bowl; supporting means for the front of the bowl; a linkage operatively connecting the back of the bowl to the supporting means; and means connecting the bowl to the frame whereby the resistance of the ground, during the forward movement of the frame causes a tendency, resisted and controlled by the lifting means, for the scraping edge of the bowl to descend.

STANLEY S. MOORE. 

